US3595590A - Piston ring - Google Patents

Piston ring Download PDF

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Publication number
US3595590A
US3595590A US835645A US3595590DA US3595590A US 3595590 A US3595590 A US 3595590A US 835645 A US835645 A US 835645A US 3595590D A US3595590D A US 3595590DA US 3595590 A US3595590 A US 3595590A
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US
United States
Prior art keywords
layer
wear
piston ring
sliding
resistant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US835645A
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English (en)
Inventor
Horst Beyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goetzewerke Friedrich Goetze AG
Original Assignee
Goetzewerke Friedrich Goetze AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19681751573 external-priority patent/DE1751573C3/de
Application filed by Goetzewerke Friedrich Goetze AG filed Critical Goetzewerke Friedrich Goetze AG
Application granted granted Critical
Publication of US3595590A publication Critical patent/US3595590A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials

Definitions

  • the present invention relates to a piston ring whose cylinder-contacting surface has axially arranged bands of a wear resistant material such as chromium and a sliding-friction resistant material such as molybdenum.
  • Molybdenum surfaces on piston rings have less tendency than other surfaces to develop pitting. However, molybdenum surfaces are not as resistant to wear as are surfaces of, for example, hard chromium.
  • Piston rings having an insert ring on which a chromium surface has been applied are already known. Furthermore, at-
  • run-in surfaces have been imbedded in one or more grooves on the chrome-plated surface of a piston ring. Such grooves have extended through to the basic piston ring material, so that a strong bonding of the runin material to the base material was achieved. It is also known to make the run-in surface of molybdenum or titanium andto extend such material axially so that it entirely covers the chromium layer. However, then the different materials are not utilized at the same time but only one after the other.
  • piston rings with edge bands of chromium or molybdenum and having a central band of the basic material of the ring are known.
  • the central band may be convex, concave, or planar.
  • FIG. I is a section of a piston ring according to the invention, the section plane including the axis of the ring.
  • FIG. 2 is a section as in FIG. I of a second piston ring according to the invention. 7
  • FIG. 3 is a section as in FIG. I of a third piston ring according to the invention.
  • FIG. 4 is a section through grinding apparatus, the section plane being perpendicular to the rotation axes.
  • FIG. is a partially schematic, partially sectional elevation of an electroplating apparatus.
  • FIG. 6 is a schematic illustration of a flame-spraying process.
  • FIG. 7 is a section as in FIG. 1 of the piston ring of FIG. I before its manufacture is complete.
  • the support ring 1 of the piston ring of FIG. I has a central protrusion 2 projecting radially relative to piston ring axis 20 outwards on its outer surface 13, thus creating depressions 35 of constant and equal radius R,,,.
  • a substantially uniformly thick layer 3 of hard chromium, a wear-resistant material is provided on this outer surface.
  • the depressed portions of the hard chrome have been built up with layers 4 and 5 of molybdenum, a sliding-friction resistant material.
  • the support ring 6 of FIG. 2 exhibits a radial protrusion 7 at its lower edge.
  • the outer surface of this support ring has been coated with a layer 8 if chromium of substantially uniform thickness, and the depressed region of the chrome layer adjoining that on protrusion 7 is provided with a layer 9 of molybdenum.
  • the support ring 10 has a wave-shaped profile with three protrusions on its outer surface.
  • the resulting depressions in the hard-chrome layer 11 are filled with molybdenum layers 12.
  • the difference R R, in FIG. 1 equals l.5 mm.
  • composition of the cast iron of the support ring is as follows:
  • the cast iron support ring 1 is then prepared for plating on its outer surface 13 by turning.
  • the support ring I is then clamped between plastic plates 28 by bolt and wing nut'29. Rubber washers 30 are provided to seal the interior of the ring from the plating solution 31, whose composition is 250 g/l Cro,
  • switch 34 Upon hanging the assembly in the plating solution using rod 32 and hooks 33, switch 34 is closed for about 5 hours, during which time the current density at the outer surface 13 is 50 Amp./dm.
  • the anode is made of lead. This places a hard chrome layer 3 of thickness 0.2 mm. on the outer surface 13.
  • the hard chrome surface is roughened by sand blasting using as sand corundum, silicon carbide, or diamond dust.
  • the support ring is then ready for application of Mo, as a sliding-friction resistant material, in the depressions 35 of the hard chrome surface.
  • the toughening enables a better bonding of the Mo and provides oil catching pockets in any finally exposed chromium.
  • a preferred surface roughness is circa 20 Rt.
  • FIG. 6 shows the chrome-plated support ring I mounted for rotation with spindle 36.
  • Spindle 36 is mounted at its ends in any conventional means to effect its rotation.
  • the tangential surface velocity v, of the support ring 1 is 50 meters per minute.
  • the thickness t of the support ring is 4.5 mm.
  • the flame spray gun 37 is fed by a molybdenum supply 38 and a fuel and compressed gas supply 39.
  • the nozzle cone angle of the gun 37 and its distance from the surface of the support ring 1 are chosen to maximize uniformity of deposition while minimizing losses due to missing of the ring and subsequently required finish grinding. Such considerations are well known in the art.
  • the flame spray gun 37 blows atomized molten molybdenum onto the chrome surface of the support ring 1.
  • the composition of the fuel is a mixture of acetylene and oxygen in such proportions that the flame is nearly neutral, i.e., neither oxydizing nor reducing. It is burned with oxygen as oxidant at zero percent by weight excess oxygen.
  • the entire surface of molybdenum is applied in six passes of the support ring.
  • the molybdenum is allowed to build up an excess thickness e (FIG. 7) of about 0.2 mm. over the chromium on the protrusion 2, in order that depressions 35 become completely filled.
  • This extra thickness is subsequently removed to yield the finished piston ring of FIG. 1 by a grinding operation similar to that depicted in FIG. 4. This final grinding assures that at the abutment between the exposed faces of Cr and M the exposed-face radius is continuous in passing from the Mo face to the Cr face or vice versa, as opposed to a discontinuous behavior which would be present ifa ledge existed at the abutment.
  • the exposed-face radius R is a constant in FIG. I, while it varies as a function of axial distance in FIG. 2, the variation of R, in FIG. 2 at the Mo-Cr abutment nevertheless being continuous.
  • the spraying of FIG. 6 is carried out in an atmosphere of air.
  • the hard-chrome layer can be replaced by a hardnickel layer, and the surface of wear-resistant material can be roughened by a chemical etching process before application of the sliding-friction resistant surface, instead of using a sand blasting operation.
  • a piston ring comprising a support ring having an outer surface provided with a radial protrusion whereby part of the outer surface is radially depressed relative to said protrusion, a layer of wear-resistant material coating the outer surface of said support ring, said layer of wear-resistant material having a substantially uniform thickness whereby its outer surface is a replica of the outer surface of said support ring, and a layer of sliding-friction resistant material coating said layer of wear-resistant material in its radially depressed part.
  • a piston ring as claimed in claim 1 said protrusion being centrally located in the outer surface of said support ring, the depressed part of the outer surface being of constant equal radius.
  • a piston ring as claimed in claim 1 the depressed part of the outer surface being of constant and equal radius, said layers of wear-resistant material and sliding-friction resistant material having exposed faces of constant radius.
  • a piston ring as claimed in claim 1 said sliding-friction resistant material coating said layer of wear-resistant material on a roughened face thereof.
  • a piston ring as claimed in claim 1 said wear-resistant and sliding-friction resistant layers having exposed faces, the exposed-face radius being continuous in passing from the wear-resistant layer to the sliding-friction resistant layer or vice versa.
  • a piston ring as claimed in claim 8 said wear-resistant layer being chromium.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Coating By Spraying Or Casting (AREA)
US835645A 1968-06-21 1969-06-23 Piston ring Expired - Lifetime US3595590A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681751573 DE1751573C3 (de) 1968-06-21 Kolbenring für Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3595590A true US3595590A (en) 1971-07-27

Family

ID=5692359

Family Applications (1)

Application Number Title Priority Date Filing Date
US835645A Expired - Lifetime US3595590A (en) 1968-06-21 1969-06-23 Piston ring

Country Status (3)

Country Link
US (1) US3595590A (de)
FR (1) FR2011353A1 (de)
GB (1) GB1269704A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762010A (en) * 1969-08-15 1973-10-02 Nippon Piston Ring Co Ltd Piston ring and manufacture thereof
JPS50158751A (de) * 1974-06-14 1975-12-22
US4176434A (en) * 1977-01-19 1979-12-04 Koppers Company, Inc. Method of making piston rings with chrome-filled grooves
US6325385B1 (en) * 1998-10-15 2001-12-04 Teikoku Piston Ring Co., Ltd. Piston ring
US20100044967A1 (en) * 2007-02-17 2010-02-25 Johannes Esser Piston ring
EP3530400A1 (de) * 2018-02-23 2019-08-28 MAN Truck & Bus SE Verfahren zum herstellen eines bauteils, insbesondere fahrzeugbauteils, und entsprechend hergestelltes bauteil
US11365806B2 (en) 2019-09-09 2022-06-21 Tenneco Inc. Coated piston ring for an internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5412022A (en) * 1977-06-25 1979-01-29 Goetzewerke Machine portion material exposed to wear that has coating layer on sliding surface in shape that riser portion is mounted to one side or both sides

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762010A (en) * 1969-08-15 1973-10-02 Nippon Piston Ring Co Ltd Piston ring and manufacture thereof
JPS50158751A (de) * 1974-06-14 1975-12-22
US4176434A (en) * 1977-01-19 1979-12-04 Koppers Company, Inc. Method of making piston rings with chrome-filled grooves
US6325385B1 (en) * 1998-10-15 2001-12-04 Teikoku Piston Ring Co., Ltd. Piston ring
US20100044967A1 (en) * 2007-02-17 2010-02-25 Johannes Esser Piston ring
US8356820B2 (en) * 2007-02-17 2013-01-22 Federal-Mogul Burscheid Gmbh Piston ring
EP3530400A1 (de) * 2018-02-23 2019-08-28 MAN Truck & Bus SE Verfahren zum herstellen eines bauteils, insbesondere fahrzeugbauteils, und entsprechend hergestelltes bauteil
CN110185550A (zh) * 2018-02-23 2019-08-30 曼卡车和巴士股份公司 用于制造构件特别是车辆构件的方法和相应地制造的构件
US11498126B2 (en) 2018-02-23 2022-11-15 Man Truck & Bus Ag Method for producing a component, in particular vehicle component, and correspondingly produced component
US11365806B2 (en) 2019-09-09 2022-06-21 Tenneco Inc. Coated piston ring for an internal combustion engine

Also Published As

Publication number Publication date
DE1751573B2 (de) 1977-05-18
FR2011353A1 (de) 1970-02-27
GB1269704A (en) 1972-04-06
DE1751573A1 (de) 1971-05-19

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